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Cornerstone Feb 26 - Mar 4 25 questions
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Monday 23 February 2026

Keystones #54 · Five questions · Open this day only

  1. 1. Number

    Calculate: 828 + 714

    Answer: 828 + 714 = 1542
  2. 2. Algebra

    Factorise: 48x + 42

    Answer: 6(8x + 7)
  3. 3. Geometry

    Find the area of a circle with radius 3cm

    Answer: 28.27cm²
  4. 4. Ratio

    Simplify: 12:6:6

    Answer: 2:1:1
  5. 5. Statistics

    Find the mean of: 15, 2, 7

    Answer: 8

Tuesday 24 February 2026

Keystones #55 · Five questions · Open this day only

  1. 1. Number

    What is the missing number: 59 + ? = 172

    Answer: 113
  2. 2. Algebra

    Simplify: 7x + 5x

    Answer: 12x
  3. 3. Geometry

    Opposite = 14cm, hypotenuse = 19.8cm. Find the angle

    Answer: 45° (approximately)
  4. 4. Ratio

    Calculate 50% of 82

    Answer: 41
  5. 5. Statistics

    Calculate the mean of: 42, 38, 32, 42, 18, 13, 11, 21

    Answer: 27.1

Wednesday 25 February 2026

Keystones #56 · Five questions · Open this day only

  1. 1. Number

    Calculate: 73 + 94

    Answer: 73 + 94 = 167
  2. 2. Algebra

    Solve: 2x = 20

    Answer: x = 10
  3. 3. Geometry

    Calculate the area of a circle with diameter 24cm

    Answer: 452.39cm²
  4. 4. Ratio

    Simplify the ratio 25:15

    Answer: 5:3
  5. 5. Statistics

    Find the mean of: 7, 7, 11, 11

    Answer: 9

Thursday 26 February 2026

Keystones #57 · Five questions · Open this day only

  1. 1. Number

    Find the total of 246, 273, and 107

    Answer: 626
  2. 2. Algebra

    Factorise: 3x² + 8x

    Answer: x(3x + 8)
  3. 3. Geometry

    Find the hypotenuse of a right triangle with sides 6cm and 8cm

    Answer: 10cm
  4. 4. Ratio

    Simplify the ratio 15:9

    Answer: 5:3
  5. 5. Statistics

    What is the probability of rolling a 3 on a fair die?

    Answer: 16

Friday 27 February 2026

Keystones #58 · Five questions · Open this day only

  1. 1. Number

    Calculate: 35 + 62

    Answer: 35 + 62 = 97
  2. 2. Algebra

    Solve: x + 3 = 14

    Answer: x = 11
  3. 3. Geometry

    Opposite = 14cm, adjacent = 11cm. Calculate the angle

    Answer: 51.8°
  4. 4. Ratio

    Simplify the ratio 18:6

    Answer: 3:1
  5. 5. Statistics

    Calculate the mean of: 33, 43, 14, 24, 6, 14

    Answer: 22.3